Alloy



Patented Feb. 1933 UNITED STATES PATENT o ICE I -BOBEB'1' H. LEAOH, OI I'AIBI'IEIID, CONNECTICUT, ASSIGNOR v'JPO HANDY & HARMAN, OF NEW YORK, N. Y, A CORPORATION OF NEW YORK ALLOY No Drawing. continuation of This invention relates to alloys and is concerned more particularly with a novel alloy which is especially adapted for brazing purposes. The new alloy flows freely at relatively low temperatures so that it can be employed without probability of damage to the objects to be united, it has excellent physical properties which enable it to produce strong oints, and for many purposes it may be used without a flux. Also, the alloy of the invention has a wide range of utility and it may be employed for brazingiron, steel, a large number of non-ferrous metals, and alloys.

The new alloy contains a relatively large proportion of silver and lesser amounts of copper, zinc, cadmium, and phosphorus, the range of these ingredients being substantially as follows: Q

l Per cent Silver 48 to 52 Copper 12 to 16 Zinc 14 to 18 Cadmium 16 to 20 Phosphorus 0. 5 to 2 A specific formula for an alloy of the new type which is desirable for the purposes mentioned is given in the following example, in which approximate amounts are given:

1 Per cent Silver 48 to 49 Copper -L 15. 5 Zinc- 16. 5 Cadmium i 18 Phosphorus 1 to 2 Another specific formula for a satisfactory alloy of the new type is as follows, the amounts being approximate: v

Percent application Serial K 0. 622,108, filed July 12, 1932. This application filed August 13, 1932.. Serial No. 828,768.

An alloy within the range mentioned flows freely at about 1175 F. so that it can be widely used for brazing without the liability of the objects to be joined being damaged.

At the same time the new alloy has physical properties which make it highly desirable, and for many purposes, it requires no flux. The latter feature is of particular importance since borax, which is a common flux, does not become a thin fluid until heated to about 1400 F. and is almost solid at 1175 I am aware that silver alloys, known as. .solders and containing silver, mm, and

copper are now in wide use, but, while .it is possible to produce a solder containing those three ingredients which has a melting point comparable with that of the new alloy, an

alloy consisting of those ingredients and having that melting point does not have satisfactory physical properties. Accordingly, when a silver-copper-zinc alloy is used for brazing, either the objects to be united must be subjected to a temperature which may do damage to them, or else to protect them against such temperatures, an alloy of undesirable physical characteristics must 'be used. With the new alloy, strong joints may be obtained without using detrimentally high temperatures. 1

- This "application is a continuation of my co-pending application, Serial No. 622,108, filed July 12,1932.

What Iclaim:

1. An alloy which consists of silver from about 48% to 52%, copper from about 12% to 16%, zinc from about 14% to 18%, ca&-

mium from about 16% to 20%, and phosphorus from about 0.5% to 2%.

2. An alloy which consists of about 48% to 49% silver, about 15.5% copper, about 16.5% zinc, about 18% cadmium, and about 1% to 2% phosphorus.

3. An alloy which consists of about 49 silver, about 15.5% copper, about 16.54% zinc, about 18% cadmium, and about 1% phosphorus.

In testimony whereof I aifix my signature.

ROBERT H. LEACH. 

